Delphi DLL 消息循环 Synchronize SendMessage PostMessage

procedure DllMain(Reason: Integer); register;
begin
   case reason of

    DLL_PROCESS_ATTACH:   //整个DLL的初始化代码
    begin
     // library enter code
     SaveApplication := Application;//调试发现装载时没执行此分支. 所以在初始化代码处显示调用.
     DLLScreen := Screen;

   
      Application.Initialize;
      if Application.Handle = 0 then
        begin
            Application.CreateHandle;
        end;
      Application.Run;
    // dm:=TDM.Create(Application);
    end;
     DLL_PROCESS_DETACH:    //整个DLL的善後程序
    begin
       b_Terminated:=True;
    Application := SaveApplication;
    Screen:=DLLScreen;


     // library exit code
//     Application := DLLApp;
//     Screen := DLLScr;
     CoUninitialize;
     //dm:=TDM.Create(Application);
    end;

    DLL_THREAD_ATTACH: //当主叫端开始一个Thread时
     ;

    DLL_THREAD_DETACH:  //当主叫端终止一个Thread时
     ;
  end;

end;

 

begin
 CoInitialize(nil);
 DllMain(DLL_PROCESS_ATTACH);
 DLLPROC :=  @DllMain; //dll入口函数.调试发现是在释放dll时执行DLL_PROCESS_DETACH分支.
end.

　　

在 DLL 需要自己消息循环时，Application.Handle 不可为0，如果为0,如果为0，则  Synchronize  同步  SendMessage PostMessage 等均有可能不可用
而通过  

       Application.Initialize;
      if Application.Handle = 0 then
        begin
            Application.CreateHandle;
        end;
      Application.Run;
代码，则可实现delphi DLL中自己的消息循环